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Toxic potencies of extracts of sediment and settling particulate matter collected in the recipient of a bleached pulp mill effluent before and after abandoning chlorine bleaching
Dept. of Environmental Toxicology, Uppsala University, Uppsala, Sweden .ORCID iD: 0000-0001-7338-2079
Aquatic Chemical Ecotoxicology, Department of Zoology, Stockholm University, Stockholm, Sweden; Inst. of Appl. Environ. Research, Laboratory for Aquatic Ecotoxicology, Stockholm University, Nyköping, Sweden .
Department of Toxicology, Uppsala University, Uppsala, Sweden.
Aquatic Chemical Ecotoxicology, Department of Zoology, Stockholm University, Stockholm, Sweden .
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1997 (English)In: Environmental Toxicology and Chemistry, ISSN 0730-7268, E-ISSN 1552-8618, Vol. 16, no 6, 1187-1194 p.Article in journal (Refereed) Published
Abstract [en]

Extracts of bottom sediment and settling particulate matter (SPM) samples collected in the recipient water body of a bleached pulp mill effluent were separated into three fractions: monoaromatic/aliphatic compounds, diaromatic compounds (e.g., polychlorinated biphenyls, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans), and polyaromatic compounds assessment of dioxinlike potency were an in vitro assay, based on the induction of 7-ethoxyresorufin-O-deethylase (EROD) in chicken embryo livers, a test for EROD induction in ovo using chicken embryos, and an immunotoxicity test measuring inhibition of lymphoid cell development in cultured fetal mouse thymuses. The samples collected closest to the mill were the most potent. There was a time-dependent decrease in dioxinlike potency in the SPM samples collected near the mill, which coincided with the cessation of chlorine gas bleaching at the mill. The bioassays in general, and the in vitro chicken embryo liver bioassay in particular, proved useful in the assessment of dioxinlike compounds in the sediment and SPM samples. The polyaromatic fractions of the samples were generally more potent than the diaromatic fractions. Only a small part of the effects caused by the polyaromatic fractions could be explained by 15 analyzed PAHs, indicating the presence of unquantified polyaromatic compounds with dioxinlike effects. This investigation indicates that the cessation of chlorine bleaching in the pulp mill resulted in a reduced load of diaromatic dioxinlike compounds in the recipient water body.

Place, publisher, year, edition, pages
1997. Vol. 16, no 6, 1187-1194 p.
Keyword [en]
7-Ethoxyresorulin-O- deethylase; Bleached pulp mill effluents; Cytochrome P4501A; Sediment toxicity; Tetrachlorodibenzo-p-dioxin equivalents
National Category
Environmental Sciences
Research subject
Enviromental Science
Identifiers
URN: urn:nbn:se:oru:diva-41347DOI: 10.1002/etc.5620160613ISI: A1997XC44200013Scopus ID: 2-s2.0-0031172183OAI: oai:DiVA.org:oru-41347DiVA: diva2:780384
Available from: 2015-01-14 Created: 2015-01-14 Last updated: 2016-12-02Bibliographically approved

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